alexML: So it is entirely plausible that the bulk of the image result is largely a byproduct of the sampling on the YCbCr elements, in particular, the Cb Cr. A LERP will most greatly augment the blocking for example.

(and even then, there are _two_ variants. Technically a 'full range' according to specification must skip values 0 and 255, but Canon's for example, violate this and actually record data on those two values)

alexML: The difference between a LERP to a cubic for example, is _huge_, and will have a _huge_ impact on the result. Doubly so if we consider that the Y is vastly more relevant for some types of visual things, and other times chroma is.